Recess-boring tool.



110.845,36@ PATBNTBDPBB-26,1907. M. JUNGLING.

REGBSS BURING TOOL.

, APPLIOATIOI FILED 1111.223, 1904.

Ilo

UNITED STATES PATENT OFFICE.

RECESS-BORING TOOL.

Specification of Letters Patent.

Patented Feb. 26, 1907.

Application filed July 23, 1904. Serial No. 217.894-

To all whom t may concern:

Be it known that I, MICHAEL JUNGLING, a citizen of the United States,residing at Kingwood, in the county Aof Golquitt and State of Georgia,have invented new and useful Improvements in Recess-Boring Tools, ofwhich the following is a specification.

This invention relates to a recess-boring tool; and the object thereofis to construct a recess-boring tool which will in one operation bore arecess having a portion of its length cylindrical in contour and theremaining portion tapering or conical in contour.

The invention aims to provide a recessboring tool which can be used in amachine or with a 4carpenters ordinary brace, and, furthermore, aims toprovide the tool with means for automatically limiting the boringthereof and for automatically returning the boring-bit to its normalposition.

The invention further aims to construct a recess-boring tool for boringat one operation a recess havmg a portion of its length cylindrical incontour and the remaining portion tapering or conical and which shall besimple in its construction, strong, durable, efficient in its use, andcomparatively inexpensive to manufacture.

With the foregoing and other objects in view the invention consists ofthe novel combination and arran ement of parts hereinafter morespecifica ly described, illustrated in the accompanying drawings, andparticularly pointed out in the claims hereunto appended.

In describing the invention in detail reference is had to theaccompanying drawings, forming a part of this specification, whereinlike reference characters denote corresponding parts throughout theseveral views, and in which* Figure 1 is a sectional elevation of thetool. Fig. 2 is a side elevation showing the flaring cutter in itsoperative position. Fig. 3 is arear view showing the abutment-cage, andFig. 4 is an inverted plan view of the deilecting-bar.

' Referring to the drawings by reference characters, 1 denotesarotatablecasing having an enlarged skeleton end. Said end is termed acage The cage comprises a rin 2 of greater diameter than the casing 1,and said ring 2 is connected with the casing through the medium of aplurality of inclined arms 3 3a 3b, which haveintermediate their ends ontheir inner faces inwardly-extending integral protuberances 4 4a 4b. Theprotuberances have their inner ends segmentshaped in contour and whichform a semicylindrical guide-passage for the sectional boring-bit, to behereinafter referred to. The protuberances 4 4a 4b constitute what maybe termed the boring-bit guide. The protuberances 4 and 4a of the arms 3and 38L are apertured for a purpose to be presently referred to, andmounted upon the said protuberances 4 and 4a and the arms 3 and 3a is adeilecting-bar 5 for a flaring cutter which forms a section of theboring-bit and which will be hereinafter referred to. Each end of thedelecting-bar 5 is provided with screwthreaded openings and throughwhich eX- tend retaining-screws 6, engaging in the openings of theprotuberances 4 4a of the arms 3 3 for securing said deiiecting-bar 5 inposition to one side of the abutment-cage. The deilecting-bar 5 is cutaway on its under face to form an angular guide-passage 7, through whichtravels the flaring cutter, to be presently referred to, the side Walls8 of the passage 7 tapering inwardly as Well as extending in a diagonalmanner, so as to cause the flaring cutter to move outwardly 0H the othersection of the bit and causing the boring of the conical or taperingportion of the recess, such action not to be had until after the boringof the cylindrical portion of the recess. The guide-passage 7 is notarranged centrally of the deflecting-bar 5, but to one side of thecenter, and to prevent the engagement of the sectional boring-bit, to behereinafter referred to, with the underneath face of the deflecting-bar5 the same is cut away, as at 9, forming thereby an intervening spacebe- A tween the underneath face of the deflectingbar and the upper faceof one section of the boring-bit.

The reference character 10 denotes the cylindrical boring-section of theboringbit and which has a flat side, as at 11. The cylindricalboring-section 10 is further provided with the cutting edges 12 13, thescrew-point 14, and cutting edge 15. Mounted upon the flat side of thesection 10 is the conical boring-section of the boring-bit and which istermed a flaring cutter 16. At its upper end the flaring cutter 16 ispivoted causes the flaring cutter 16 to extend atV an angle with respectto the guide-passage 7 in the deiiecting-bar 5.

project over the edge of the flat side of the cylindrical boring-section10 until the boringbit has been in operation to form the cylindricalpart of the recess.

The referencey character 23 denotes the shank of the sectionalboring-bit and which extends through the casing 1, projects from theupper end of the casing 1, and is surrounded within the casing by acompression or extracting spring 24, the latter abutting at one endagainst the fixed collar 25 and at its other end against the lower endof the casing 1. The collar 25 carries a stop-pm 26, which extendsthrough an elongated slot 27 in one side of the casing 1. The stop 26limits the return movement of the shank of the bit, while the forwardmovement of the shank 23 of the bit is limited through the medium of anadjustable stop-collar 28, fixed upon the shank 23. Said collar 2S onthe forward movement of the bit engages the upper end of the casing 1,consequently arresting the boring operation. The shank of the bit can beattached to an operating part therefor of a boring-machine, but if usedin connection with a carpenters brace an extra socket 30 is employed.

The operation of the tool is as follows: The enlarged skeleton end ofthe casing 1 coming in contact with the piece of work which is to bebored, although revolving with the bit, owing to the arrangement of thestop-pin 26, stands in relative position, while at the same time thebit, which works freely up and down in the casing, -is forced into thewood by an operating-lever therefor attached to a boring-machine orcarpenters brace, whichever the case may be, as it can be used ineither. When the offset in the ilaring cutter 16 comes into contact withthe deflectingbar 5, it forces the flaring cutter 16 against the side ofthe aperture being bored, thereby increasing the size of the holegradually until stop-collar 28 comes in contact with the casing 1 at thetop. At the same time the downward motion of the bit compresses theextracting-spring 24 by contact of the retaining-collar 25, which isheld in position on Vthe shank of the bit by the stop-pin 26. The pinWorking through the slot 27 in the casing 1t at The normal position ofthe flaring cutter is such that it does not the same time holds thecasing 1 and boringbit in their relative positions. Now by relieving theforce exerted on the lever of the machine or the carpenters brace,Whichever is in use at the time, the bit is operated, the tension on theextracting-spring 24, exerting its force on the retaining-collar 25,will force the boring-bit out of the hole before the casing 1 will leaveits relative position from the piece of work which is being bored. Atthe same time the oii'set in the flaring cutter 16 in opposite orreturning motion again comes in contact with the deflecting-bar 5,forcing the flaring cutter 16 back to its normal position before thecasing 1 leaves its position, thereby assuring a smooth flaring holelarger at the base than at the top.

The tool, which operates automatically, can be used either in aboring-machine running at as high a speed as two thousand and twothousand five hundred revolutions per minute or in an ordinarycarpenters brace, which is worked by hand, if desired. A hole can bebored straight part of the depth-say threeeighths or one-half inch fromthe top of the hole-before the flare commences, thereby giving the dowelor piece inserted a straight lsolid bearing, which will hold it morerigid than if the flare begins at entrance or top of the hole. Then byhaving a wedge inserted in the end ofthe piece which is to be fastenedinto the recess it spreads same at the bottom .and makes it impossibleto pull out or Work loose without the use of nails or glue.

It is thought the many advantages of a recess-boring tool constructed inaccordance with the foregoing description, taken in connection with theaccompanying drawings, can be thoroughly understood, and it willfurthermore be evident that changes, varia tions, and modifications canbe resorted to without departing from the s irit of the in vention orsacrificing an of t e advantages of the invention, and I t erefore donot wish to restrict myself to the details of construey tionhereinbefore described, and as shown in the accompanying drawings, butreserve the right to make such changes, variations, and modifications ascome properly Within the scope of the protection prayed.

Having thus fully described my invention, what l claim as new, anddesire to secure by Letters Patent, isd

A recess-boring tool comprising a rotatable casing having an enlargedskeleton end forming a cage provided with a guide-passage, adeflecting-bar secured to said cage and provided with a passage opposingthe passage in the cage, said passage in said deflectingbar providedwith inclined walls, and a bit rotating with said cage and formed of twosections, one of said sections pivoted upon the other, said pivotedsection provided with angularly-disposed portions, adapted to travelIOC) IIC

through the passage in the deflecting-bar and my hand in presence of twosubscribing Witegage thl Walls of sakfi passage, eausing messes. t erebyt e defleotn o said ivote see- T tion, and the other of sgaid sect-ioiisof said bit MICHAEL TUB GLING 5 adapted to travel through theguide-passage Witnesses:

in the cage. W. W. AsHBURN, In testimony whereof I have hereunto set lD. F. ARTHUR.

